function test

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace function_test
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
public void bluX()
{
if (this.BackColor == Color.Blue)
{
this.BackColor = Color.Black;
}
else
{
this.BackColor = Color.Blue;
}
}
private void button1_Click(object sender, EventArgs e)
{
bluX();
}

}
}